RE: Transformers

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Ted Rosenberg by way of Terry Fritz <twftesla-at-uswest-dot-net>" <Ted.Rosenberg-at-radioshack-dot-com>

Tim:
We make the presumption that if you take two identical NSTs and place them
do the AC IN terminals are facing the same way, that the HV terminals will
be also the same. But maybe not. If just one of the NSTs has leads that are
not exactly the same (start and finish of the winding internally) but you
assume they are, then when you parallel the two, the NSTs will be out of
phase. At that point, swap the leads of just one. Sorry I wasn't more clear.
One picture is worth...but no pictures allowed here  ;(

At least if you guess wrong, no damage is done  : )

I plan to color code all my HV leads when I assemble my bank of NSTs. Again,
it's a safety configuration approach. As you well know, in electronics,
sometimes when you go OOPS you don't get a second chance.

BTW, Terry confirmed that one MOV array has enough room to spare to handle
up to 180ma. I thought I was going to have to spend $50 x 3 at Digikey.

Safety First

Ted

===============
Subject: Re: Transformers


Original poster: "Tim by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<warpath-at-wtp-dot-net>

Thanks Ted, I am wondering what do you mean by " reverse just one lead". I
understand parallel to mean that
positive goes to positive and negative goes to negative but the HV leads on
the transformer are unmarked(no
positive or negative). Do you mean that I would take the leads of one
transformer and just switch them?  Tim

Tesla list wrote:

> Original poster: "Ted Rosenberg by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <Ted.Rosenberg-at-radioshack-dot-com>
>
> Yes, Tim. It is. Connect the two in phase to get 15KV at 60ma.
> It helps if the two are the same brand and config. Typically just
connecting
> the HV leads in parallel will do it. If the spark is minimal, reverse just
> one lead.
> The input is just paralleled.
> I plan to do exactly that for the three 15/60s I have to get 15/180.
>
> Be sure to use Terry's NST protection circuit to keep them alive.
>
> Safety First
>
> Ted
>
> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Tuesday, January 02, 2001 5:54 PM
> To: tesla-at-pupman-dot-com
> Subject: Transformers
>
> Original poster: "Tim by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> <warpath-at-wtp-dot-net>
>
> Hi All, Is it possible to hook two 15kv/30ma transformers together to
> get a bigger bang(longer bolts of lightning) ? Tim